{{tag>Brouillon}}

= Notes libvirt

Voir :
* [[todo-kvm|Notes KVM]]
* https://ubuntu.com/tutorials/multipass-and-libvirt-vms-on-ubuntu-managed-via-landscape#2-install-libvirt

Voir aussi :
* https://kubevirt.io/
* https://developers.redhat.com/articles/2024/02/21/virtio-live-migration-technical-deep-dive


== Install

<code bash>
apt-get install virt-manager virtinst qemu-utils
</code>

Install Ubuntu
<code bash>
virt-install --connect qemu:///system \
--name ttest02 --ram 4096 --vcpus 1 
--vnc --virt-type kvm --machine pc \
--location http://archive.ubuntu.com/ubuntu/dists/xenial/main/installer-amd64/ \
--extra-args ksdevice=link,lang=,url=http://192.168.1.5/cblr/svc/op/ks/system/ttest02,text,auto-install/enable=true,priority=critical,ipv6.disable=1 \
--arch x86_64 --os-variant virtio26 --disk path=/var/lib/libvirt/images/ttest02-disk0,size=15,format=raw \
--network bridge=br0,mac='52:54:2e:f9:98:23' \
--wait -1 --noautoconsole
</code>

Network install Debian Preseed
<code bash>
virt-install \
--name ttest02\
--ram 4096  \
--location=http://ftp.us.debian.org/debian/dists/stable/main/installer-amd64/ \
--initrd-inject=/tmp/preseed.cfg \
--extra-args="console=ttyS0,115200n8 serial locale=fr_FR console-setup/ask_detect=false keyboard-configuration/layoutcode=fr hostname=virtual domain=unassigned-domain interface=auto" \
--vcpu=1 \
--vnc \
--vnclisten=0.0.0.0 \
--os-type=linux \
--os-variant=debianwheezy \
-w bridge=virbr0 \
-w bridge=br1 \
-w network=default \
--console pty,target_type=serial \
--disk format=qcow2,size=8,bus=virtio,path=/var/lib/libvirt/images/vm1.qcow2
</code>

Install ISO Debian Preseed
<code bash>
virt-install \
--name vm1 \
--ram 1024 \
--cdrom /tmp/debian10ps-kvm.iso \
--vcpu=1 \
--vnc \
--vnclisten=0.0.0.0 \
--os-type=linux \
--os-variant=debiantesting \
-w bridge=virbr0 \
-w network=default \
--console pty,target_type=serial \
--disk format=qcow2,size=20,bus=virtio,path=/var/lib/libvirt/images/vm1.qcow2 \
--boot uefi \
--wait=-1 --noautoconsole
</code>



== Interface d'admin

=== WebUI - Cockpit

Voir :
* [[notes_cockpit]]

<code bash>
apt-get install cockpit cockpit-machines
</code>


== Console graphique VNC

Connaitre le port
<code bash>
Connexion VNC
virsh dumpxml ttest02 | grep vnc
</code>


== Effacement

<code bash>
virsh destroy ttest02
virsh undefine ttest02
virsh undefine ttest02 --nvram
</code>


Pb effacement 
<code ->
virsh # undefine --remove-all-storage --delete-snapshots vmplop
error: Failed to undefine domain vmplop
error: Requested operation is not valid: cannot delete inactive domain with 1 snapshots
</code>

Solution
<code bash>
snapshot-delete --metadata --current vmplop
</code>




== Réseau

=== DHCP avec adresses statiques

Tout d'abord, recherchez les adresses MAC des machines virtuelles auxquelles vous souhaitez attribuer des adresses IP statiques:

<code bash>
virsh  dumpxml  $VM_NAME | grep 'mac address'
</code>

Puis éditez le réseau
<code bash>
virsh  net-list
virsh  net-edit  $NETWORK_NAME    # Probably "default"
</code>

Trouvez le <dhcp> section, restreignez la plage dynamique et ajoutez des entrées d'hôte pour vos machines virtuelles

<code xml>
<dhcp>
  <range start='192.168.122.100' end='192.168.122.254'/>
  <Host mac='52:54:00:6c:3c:01' name='vm1' ip='192.168.122.11'/>
  <Host mac='52:54:00:6c:3c:02' name='vm2' ip='192.168.122.12'/>
  <Host mac='52:54:00:6c:3c:03' name='vm3' ip='192.168.122.12'/>
</dhcp>
</code>


Recharger la conf réseau
<code bash>
virsh  net-destroy  $NETWORK_NAME  
virsh  net-start    $NETWORK_NAME  
</code>

Source : https://www.it-swarm.dev/fr/dhcp/kvm-libvirt-comment-configurer-des-adresses-ip-dinvites-statiques-sur-lhote-de-virtualisation/960375558/


=== kvm host to guest connections

Source : https://wiki.libvirt.org/page/TroubleshootMacvtapHostFail

''/tmp/isolated.xml''
<code xml>
   <network>
     <name>isolated</name>
       <ip address='192.168.254.1' netmask='255.255.255.0'>
       <dhcp>
         <range start='192.168.254.2' end='192.168.254.254' />
       </dhcp>
     </ip>
   </network>
</code>

<code bash>
virsh net-define /tmp/isolated.xml
virsh net-start isolated
virsh net-autostart isolated
</code>

<code bash>
virsh edit vm-plop
</code>

<code xml>
   <interface type='network'>
     <source network='isolated'/>
     <model type='virtio'/> <-- This line is optional.
   </interface>
</code>


=== Bridge direct

<code bash>
virsh dumpxml vm1 | xpath -e '/domain/devices/interface[@type="direct"]'
</code>

<code xml>
<interface type="direct">
      <mac address="52:54:00:c1:02:bb" />
      <source dev="eno4" mode="bridge" />
      <target dev="macvtap0" />
      <model type="virtio" />
      <alias name="net0" />
      <address type="pci" domain="0x0000" bus="0x01" slot="0x00" function="0x0" />
</interface>
</code>


== Disque

=== redimensionnement à chaud

<code ->
# virsh dumpxml vm1 | xpath -q -e "/domain/devices/disk[@type='file']/alias"
<alias name="virtio-disk0" />
<alias name="sata0-0-0" />
</code>

<code bash>
virsh qemu-monitor-command vm1  block_resize drive-virtio-disk0 50G --hmp
</code>


=== Redimensionnement à froid

<code ->
# virsh dumpxml vm1 | xpath -q -e "/domain/devices/disk[@type='file']/source/@file[1]"
 file="/var/lib/libvirt/images/vm1.qcow2"
</code>

<code bash>
qemu-img resize /var/lib/libvirt/images/vm1.qcow2 +10G
</code>

=== Lister les disques et leurs tailles

<code bash>
for VM in $(virsh list --all |awk '/^ [0-9-]/ {print $2}');  
do 
	echo VM_NAME: "$VM";
	virsh dumpxml $VM |xpath -q -e "/domain/devices/disk[@type='file']/source/@file[1]" |sed -e 's%^ file=%%g' |tr "\n" " " |xargs du -h
 	echo --------------;
done

</code>


== VM

=== Clone

Cloner une VM
<code bash>
virt-clone --original vm1 --name vm2 --auto-clone
</code>

=== Virsh reload xml config file

<code bash>
virsh define foo.xml
</code>

=== Connaître l'IP d'une VM

Voir aussi : https://www.cyberciti.biz/faq/find-ip-address-of-linux-kvm-guest-virtual-machine/

<code ->
# virsh domiflist FRANCE_ACME_POC2
Interface  Type       Source     Model       MAC
-------------------------------------------------------
macvtap2   direct     enp2s0f0   virtio      52:54:00:c8:c0:b2
vnet2      network    ACME_FRANCE_V rtl8139     52:54:00:c8:b8:03

# tcpdump -nn ether host 52:54:00:c8:c0:b2
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on enp2s0f0, link-type EN10MB (Ethernet), capture size 262144 bytes
21:08:36.739541 IP 192.168.98.2.80 > 192.168.219.18.50777: Flags [P.], seq 2750428795:2750428825, ack 2413241637, win 119, length 30: HTTP
21:08:36.778206 IP 192.168.98.2.80 > 192.168.219.18.50772: Flags [P.], seq 3075508646:3075508995, ack 4236506059, win 119, length 349: HTTP
21:08:36.779166 IP 192.168.219.18.50772 > 192.168.98.2.80: Flags [.], ack 349, win 251, length 0
21:08:36.893545 IP 192.168.98.2.80 > 192.168.219.18.50772: Flags [P.], seq 349:373, ack 1, win 119, length 24: HTTP
21:08:36.939877 IP 192.168.219.18.50777 > 192.168.98.2.80: Flags [.], ack 30, win 256, length 0
</code>

<code bash>
arp -e
</code>

Voir aussi :
* ''virsh domifaddr''
* ''virsh net-dhcp-leases''


== Pb

<code ->
ERROR    Guest name 'ttest02' is already in use.
</code>

Solution : Effacer !
<code bash>
virsh undefine ttest02
</code>

== IOMMU PCI_Passthrough

Voir :
* https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVMF
* http://www.virtualopensystems.com/fr/services/vfio-full-gpu-virtualization/
* https://clayfreeman.github.io/gpu-passthrough/#preparing-the-virtual-machine

Pour NVidia il faut cacher le PCI_Passthrough
<code xml>
	<kvm>
	<hidden state='on'/>
	</kvm>
</code>

''/etc/default/grub''
<code ini>
#GRUB_CMDLINE_LINUX_DEFAULT="quiet"
GRUB_CMDLINE_LINUX="quiet intel_iommu=on iommu=pt pci-stub.ids=10de:1b81,10de:10f1"
</code>


== Err /usr/bin/qemu-system-x86_64: No such file or directory

<code ->
Error starting domain: Cannot check QEMU binary /usr/bin/qemu-system-x86_64: No such file or directory
</code>

Solution
<code bash>
apt-get update
apt-get purge qemu-system-x86
apt-get install qemu-kvm
apt-get install -f
</code>